Ken Miller is well known for his work in debunking Intelligent Design Creationism, most notably for his testimony in the Dover Pennsylvania trial that demolished the legal strategies of the movement to have creationism taught in public school science classes. His book, Only a Theory: Evolution and the Battle for America's Soul recounts his experiences and argues why evolution is true.

Now, in his new book, Dr. Miller presents a radical, optimistic exploration of how humans evolved to develop reason, consciousness, and free will, contra scientists such as Richard Dawkins and Sam Harris who tell us that our most intimate actions, thoughts, and values are mere byproducts of thousands of generations of mindless adaptation. We are just one species among multitudes, and therefore no more significant than any other living creature.

Brown University biology professor Miller contends that this view betrays a gross misunderstanding of evolution. Natural selection surely explains how our bodies and brains were shaped, but Miller argues that it's not a social or cultural theory of everything. In The Human Instinct, he rejects the idea that our biological heritage means that human thought, action, and imagination are pre-determined, describing instead the trajectory that ultimately gave us reason, consciousness and free will. A proper understanding of evolution, he says, reveals humankind in its glorious uniqueness—one foot planted firmly among all of the creatures we've evolved alongside, and the other in the special place of self-awareness and understanding that we alone occupy in the universe.